Blow-off device for steam boilers



April 28, 1936.

M. H, OAKES BLOW-OFF DEVICE FOR STEAM BOILERS Filed lJune l5, 1923 2 Sheets-Sheet l wml n x l n llllllll Il l||.|||| IllllllllllllllllL April 28, 1936.' M, H AKES BLOW-OFF DEVICE FOR STEAM BOILERS FiledJune 15, 1928 2 Sheets-Sheet 2 Patented Apr. 28, 193s l. i 2,038,755.

`NJITED STATES PATENT OFFICEY f v Y l2,038,75t- Y BLOW-OFF DEvIo'E Fot .STEAM BOILERS Manuel Oakes, Chicago, Ill. Application June 15, 1928, serial No. '285,639 1 claim. (o1. 122-382) This invention relates in general to steam boil- Y boiler without the transmission of the waste sub.- ers, and more particularly, to improvements in stances, sediment, sludge :and the like tothesaid means for removing scale forming substances and feed water; the provision of .an improved blow-'olf other impurities from the boiler Water. device for steam boilers in which the sediment .re--

5 AWhile, for convenience,'the invention is illusceptacle is connected so that .boiler Water vcontrated and described as applied to a steam locotainingY the removed sediment .enters Vthe recepr motive boiler, it Will be understood thatrit'finds tacle at a point which preventsstirring .upef vthe a wide field of utility for other analogous purrefuse contents ofthe receptacle. to prevent poses. formation of scale in the discharge passageway Those skilled in the art to which this invention of thek device and as well permits of returning the it@ pertainskno-w that steam boilers, especially locorefuse water to the feed water; .the provisionof motive boilers, kare subject to scale formation on an improved blow-off device for, steam boilers theinner surfaces o-f the boiler, crown sheet, and which rapidly removes the impurities collecting tubes due tothe impurities carried into the boiler atthe lower portion of. .the steam boiler, While in the feed water, and that in this art, anumber theV latter is in operation, by `tapping into the l' of attempts have been made to provide a soboiler iat a plurality ofseparated points; and the @called blow-off device by which .the sediment, provision ina blowofi device'of means whichgperf sludge and Vother scale producing impurities in mits of periodic cleansing of the v,sediment collecthe Water can be remove-d from` the boiler after tor Without shutting down the .boiler and in fact,

each run of the locomotive. These devices vare while theboiler is in operation on a locomotive v2li unsatisfactory for the reason that much of the for example, during its run. Y scale formation takes place in the boiler while it This invention also includes an improved conf-y is in operation and before blowing-olf, and the struction of the sludge collector or iiltererV which result is .that blowing off the boiler intermittently, permits of returning the Arefuse `Water to the tank that is, after a predetermined time,vdoes not reof the Water supply for the ,boilerfor example, to 25 move theY scale. Furthermore, the boiler has to the. locomotive tender without the transmission V be `placed out of service in order that this'scale of any impurities tothe feed water. can be removed. It has also beenrdetermined The foregoing and such other objects and adthat scale formation in the boiler results from vantages as may appear or be pointed out asthis scale forming substances in the boiler Water description proceeds are attained in the strucf. `39 either those in solution or in suspension and it tural embodiment illustrated in the accompany? is one of the principal objects of the present ining drawings in which:

vention to remo-ve these substances from the .iFig. 1 is a plan View schematically showing a boiler and the boiler water automatically and steam locomotive and tender with the device of. substantially continuously, while the boiler is in this invention installed thereon; y Y 55 operation and Without requiring any constant at- Fig. 2 is a side elevation of the structure tention on the part of the engineer or fireman. in Fig. 1;

VThis invention has as further objects, the prol, Fig. ,3 is a transverse vertical sectional vision in a steam boiler of an improved means taken *on the line 3--3 of Fig. 2, showing .thearfor substantially continuously removing sediment, rangement of taps in the locomotive boiler; i0 scale forming substances and the like, which col-` Fig. 4 is an enlarged-vertical sectional View of lect at or near the bottom, while the boiler is in the sediment collector or ltering device of this operation; theprovision of an improved blow-off invention; .A device which is adapted to substantially continu- Fig. 5 is a detail of an alternative l:form of the ously remove injurious substances fromthe boiler invention; and Y Water during operation of the boiler, whereby to Fig.l6 vis afurther alternative form of the device lengthen the period of service and life of the shown in Fig. 4. p boiler and to shorten the period of lay-up for Referring now more particularly t0 the drawings cleaning; the provision of an improved blow-off and first `to Figs. 1 and 2, asteam locomotive device which increases the efficiency in operation, generally outlined in dotted lines, ythe boiler 5 59 preventing passage of sediment-to the cylinders having the conventional `fire-box 6, the bottom and pistons and other working parts of the enportion thereof being of the conventional congine; the provision of an improved device of the struction such as is shown in Fig. 3 that is, the character described which as an auxiliary may shell 5a is spaced from the crown sheet 1 and the be employed for heating the feed water to tne water legs 8 terminate in the mud 9, ,Itis 55! Vat this latter point, that a large percentage of.

the sediment representing impurities Yof the `feed water will collect inthe operation ofthe boiler.V

Y The locomotive tender is shown at I and has the These pipe sections I3 and I4 are substantially Y unrestricted and allowing free flow of boiler water YReferringagain'to Figs. 1

plurality of taps I2,

usual water tank I I. Y

and 2, I provide a I2 which are taken off from the steam boiler at separated points along the mud ring and along the lower portion of the barrel of the boiler, all connecting withan outlet pipe formed in sections I3 and I4 extending 'along a convenient part of the boiler externally thereof.

under boiler `pressure vtherethrough to the'blowoff device of this invention.

The pipe I3 is tapped by a short pipe section I5 having a shut-off cock IGYarranged therein, which cock may be employedto shut oi the water from therboiler in the event of accident to the blow-oftv Y device.

Thepipe I5 leads'to and dischargesat the upper portion lof aV receptacle I1- which may be termeda sediment collector or water ilterer.'V the latter having sumpv I8 controlled by a valve I9. The valve I 9 maybe manually operated from time to'time from the cab of thelocomotive by a system of'rods 20 so that while theengineis in operation on a run, the sediment may be blown from the receptacle I1 without A shutting down the boiler.` i i Y vInvnormal operation, the water from the boiler Y underboiler.k pressure flows to Vthe receptacle, I1,

thei valve I9 beingfclosed `and. this water passes outY through a discharge conduit 2I extending fromthe' upper portion of the "receptacle I1 and throughsections 22 and 23 anda lexible'hose 24 and'is discharged at 25 intothewater tank of the tender. Y tank'YI I will be heated bythe hotjwater passing Vthrough the sediment collector under boiler pressure; f v .Y Y

l The construction of theblow-off device is best Y illustrated YY in Fig. 4.*AS shown in Figi 4, the

chamber-"or receptacle I-1,Y which' is substantially Y cylindrical, has' an inletY IGa to whichlthe' pipe I5 is connected so thatfwater under boiler pressure posed -in the pipe "2| externally of the receptacle;

The screen'structure includes a pluralityrof bushing members 28; 29,-and 30, and a retaining cap 3l, the uppermost bushing 28 being retainedin a reducingbushing'32v which latter is threaded into a suitableopening 33.forme drinl the ftopjofthereceptale -I1;i' -Between each of the` bushings 28 and 29, 29 and 39 and between the bushing 30 and'- fc'ap`3l, I provide screenv plates 34,35, and `36 respectively. These plates have perforations yin the'mY of progressively" decreasing 'size from the i tering theYpipe 2l. The constricted passageway Y fromY the receptacle I-1.

admittingvthe boiler -water through thepipeI- lowermost tothe topnio'st so vthat sediment or any other impurities in the waterentering the r'ecepfY tacle" |11 will be -checked'and prevented from e'n- 21contr'ois the ow of dischargeV or refuse water It will be seen that by -Thus feedA water containe-Jdv in'V the Y at the top of the receptaclethis water entering Ycannot stir up the sediment collecting at the bottom of the receptacle, and thus a substantially well deiined demarkation will exist between the water entering and leaving the receptacle insuring vthat substantially all of the sediment extracted from the water by gravityrwill. remain in the receptacle I1 and not be carried into the pipe 2I. .This enables me to conduct the refuse water to the locomotive tender, especially in view of theprovision of screens. Therefore, by introducing boiler Water with its impurities substantially continuouslyV under Yboiler pressure at the topof the receptacle and removing the water substantially clear of sediment at'a point well above'the bottom of the` receptaclethrough screens and subject to the rate of iiow determined by theA constricted passageway wisewould be wastedby discharging to atmosphere to the feed water supplyY thus heating and softening the same. This has not'heretofore been practicable to my knowledge for the reason that no eifort hasbeen previouslymadeto substantially r entirely cleanse the refuse water, 'by preventing stirring up of the sediment discharged from the boilerwater as it enters the receptacle.

In'Fig. 5, I have illustrated a novel construction 21,'I am enabled to returnthewater which other- Y* for dispersion of the hot water in the tank of the Y couplings 2401;J a. and 26a to perforated pipe sec-V tions 31,- 31 arranged about the tank of the loco# tender. The pipe 23 is shown and is connectediby f Y motive tender or other water sup-ply tank so thatV c aldispersion or distribution of the hot refuse waVV Y ter is obtained and 'to therebyenhance heating-of? thefeed'water. Y Y v Y An alternative form of the receptacle isshown in Fig. 6. this receptacle I1ahavingthe screen structuren arranged in the side wail 39 and disf Y:

Chargingy laterally of thereceptacle with the vconstricted passageway 40 discharging downwardly insteadof'horizontally as'shown in Figfl. The inlet for boiler water is shown at 4I and theY out--Y let for removing sludge isV shown atV 42. [In this Y form oftheinvention byV virtuegot the provision ofy thefscreen structure 38, I am enabled to ,disgposev passageway 49 externally Vof the receptacle I1arand thus Aprevent clogging as in Fig. 4,and

of scale. sediment or the like is substantially eritirely eliminated. Y Y

1n-both forms of the invention shown in Figs.V n Y 5 and lGgit will be seen that the advantages of placing theinlets Ia and 4I at the toprand drawing off the water at a point well above the sedi- Ain addition-byplacing the constricted passageway t V4I) in afvertical instead of aV horizontal position Yclogging of the passageway due to the collection` ment a substantially clean refuse water willrbe obtained.

I-Iavin'g thus described my invention and illusf trated its useywhat I claim as new and-desire to secure by Letters Patent is: i jl* In combinationy With a boilerand a source'of Y feedfvwater'therefor, a boiler blowoff device for the boiler including a receptacle adapted to catch and retain foreign substances from the boilerand hav-I inga connection to receive water from the waterY space of the boiler independently of the source of feedwater, a passageway from said receptacle having `filtering means and a constriction-therein V.forcontrollingthe rate'of flowof waterirom thee-receptacle and boiler solely in response to steam pressure inthe boiler and independently of the source of feed water said ltering means being located in advance of said constriction.

' v l MANUEL-H. olirnis. 

